Create runtime directory in entrypoint

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/rego-tunnel/build/scripts/entrypoint.sh

@@ -24,5 +24,9 @@ cat /tmp/hosts.bak > /etc/hosts 2>/dev/null || echo "127.0.0.1 localhost" > /etc
 echo 1 > /proc/sys/net/ipv4/ip_forward
 echo "[entrypoint] IP forwarding enabled"
 
+# Ensure runtime directory exists (for host trigger files)
+mkdir -p /runtime
+echo "[entrypoint] Runtime directory ready"
+
 # Start systemd
 exec /sbin/init